Only he could understand what King Yan thought about his actions, but for the Qin State, none of this mattered, because King Yan had paid a huge expenditure of up to 500,000 gold for it. Except for the gold payment, most of the rest relied on the export of raw materials to the Qin state in exchange. Not only that, but he also embezzled part of the military spending. His army was in arrears. This does not bode well.

In contrast to the King of Yan is the King of Qin. King Qin expressed a strong interest in aviation. In particular, when the Air Force established the club, King Qin gave great support. The aviation industry of the Qin State also started with the production of hot air airships, and the Qin kings all deliberately issued them to the aviation industry.

Received special treatment from the King of Qin. Qin's aviation industry developed rapidly. In this matter, Qin's airship is no longer the hot air airship of the past, although the hot air airship is simple to operate, but it cannot carry out long-distance voyages.

Hydrogen airships, which used hydrogen as a filling gas, began to appear on the stage, and at first, the pilots and flight engineers of the Qin State could not solve a single problem. When the airbag is filled with hydrogen, the airship rises, and as the altitude increases, the atmospheric pressure gradually decreases, and the hydrogen in the capsule expands, and the airbag expands larger and larger. Later a pilot survived intensely and poked a small hole in the hydrogen. This action added a deflation valve to the airship. So that the airship can fly safely.

If this move had been placed earlier, it would have been an absolute loser, because it was not easy to obtain hydrogen at the beginning, but with the advent of power plants, the Qin State began to use the method of electrolysis of water to obtain it. This method is energy-intensive. But it's much easier to make hydrogen than using chemical reactions.

However, there have also been accidents with hydrogen airships. The airship was equipped with a bulky steam engine, and the fire line from the steam engine collided with the hydrogen gas released, causing the hydrogen airship to burn in the air. However, the pilot successfully parachuted and suffered severe burns on his arm, making him unable to fly in the future.

With the accident, the hydrogen airship was improved again, and the man named Li Kong invented the air room. This distant relative of Li Xin is very capable of flight transformation.

He made a balloon with an air chamber. It is shaped like a spindle and resembles a modern airship. This kind of balloon has a large silk capsule on the outside and a small air bag on the inside, and the small air bag has a gas valve on it. The outer capsule is filled with hydrogen to make the balloon buoyant and lifted into the air, and the inner capsule is used to fill the air. This small airbag is called the "air room".

Before the balloon lifts off, the "air chamber" is filled with air. When the balloon rises to a certain height, the "air chamber" is opened to release a portion of the air. In this way, after the outer capsule is expanded, the "air chamber" is reduced due to compression, so that the pressure of the outer capsule expansion is reduced, so as to ensure that the air capsule does not burst. This invention solves a major problem in the launch of balloons and is another major breakthrough in the history of airship development. Since then, the "air room" has been used on all airships and has been used ever since.

But the pace of flight improvement hasn't stopped here. The establishment of the Heavenly Army relied on huge technical support, and the attention of King Qin made these Heavenly Pride even more hands-off. They were the first to use the internal combustion engine on an airship. The internal combustion engine was simply modified. The sealing effect was strengthened, and a water tank was added. It is used to cool the cylinder. And the Celestial Army has a lot of diesel, which makes them even more hands-off. For this purpose, the airship made a preliminary long-distance flight. Without any landing on the way, they actually flew more than a hundred miles. When King Qin heard the news, he was overjoyed.

Except for airships. Another absolutely exciting flight made King Qin a little obsessed, not only King Qin, but even Yingyu wanted to try it. Gliders have become another way of flying, although the flight conditions and flight range are really unsatisfactory. But he has an absolute advantage over the airship. That's speed.

King Qin and Yingyu were naturally interested in things with speed. The speed of the glider surpassed that of the airship. Especially when the wind is right, the glider can fly freely. This new way of flying made King Qin and Yingyu eager to try, but the officers of the Celestial Army tried to dissuade it, believing it to be too dangerous.

Dissuaded by a cadre of officers, the King of Qin halted his adventurous actions. However, King Qin did not give up this attempt, and so did Yingyu, whose mind had already begun to construct the idea of an airline.

The flight race began. The competition seems to be a bit boring, mainly with various airships participating in competitive flights. There were more than 20 airships of various sizes floating in the sky. They are like well-fed sheep in heaven. Slow, very laid-back.

But there was a strange thing lying on the ground. A new type of flying machine. Plane.

Wang Dao is a poor boy from Taiyuan. He worked in a bicycle factory. He is very familiar with various mechanical principles. He was interested in flying from a young age. He dreams of one day being able to fly like a bird. Therefore, he came to Xianyang to see the world. In the bicycle factory, he got a job, where he learned to read, read the newspaper, and from the newspaper he learned that the Qin State had established the Celestial Army, and later the Aviation Club. He paid an expensive fee and joined the aero club as a pilot.

You know, flying is a game for the brave. Coupled with the fact that an airship is expensive, flying becomes a kind of entertainment for the upper class. And they have a monopoly on all flight items. It's hard to get in because it's expensive. The cost of an airship is more than the savings of five middle-class families for twenty years.

But Wang Dao didn't care about that, he cared about flying. He is the best pilot and has a high level, and many people are willing to fly with a pilot like him. He solves all kinds of problems. He also enjoyed this treatment very much,

Flying is wonderful. That feeling of freedom and freedom. Just like a bird. He always thought so. But the airship was too slow and too bulky. There is no lightness like a bird.

At this time, the appearance of the glider gave him the opportunity to fly like a bird. Internal combustion engines, mainly diesel, are somewhat bulky but much lighter than steam engines. What would it be like if you put a diesel engine on a glider? This idea led him to develop the Qin State, the first aircraft in all of Chinese history. His flying machine will open up a new era in the history of aviation. The era of airplanes will replace the supremacy of airships. But now he had to shake the handle desperately to start the diesel engine.